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A 7 blink error code on the TH-42PD25 indicates a fault with the power supply (P) board. It is not outputting the correct voltage to keep the TV turned on, and it will need to be replaced.
You can get a replacement power supply board from http://www.shopjimmy.com/panasonic-tnpa2841ah-p-board.htm
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Do you have a voltmeter available to take some test readings?
Ok, can you start with the P board and look for the voltage outputs on it - they should be indicated on the board.
Let me know what they measure...
Yes, tomorrow is fine!